Composition for two-component waterproof coating, two-component waterproof coating and preparation method of two-component waterproof coating

Abstract

The invention relates to the field of waterproof coatings, and discloses a composition for a two-component waterproof coating, the two-component waterproof coating and a preparation method of the two-component waterproof coating. The composition comprises a component A and a component B in a mass ratio of 1: (0.5-1.5), the component A comprises a main agent I and an auxiliary agent I, and the main agent I contains polyether hybrid resin, an epoxy resin curing agent, a filler I, a silane coupling agent I and a catalyst; the component B comprises a main agent II and an auxiliary agent II; the main agent II contains epoxy resin, a plasticizer, a filler II and water; the polyether hybrid resin is prepared from raw materials including silane modified polyether resin I, acrylic monomers, silane modified polyether resin II, a chain transfer agent, an initiator, a chain extender and a silane coupling agent II through in-situ synthesis. The waterproof coating prepared from the composition not only can tolerate a wet basal plane, but also can be quickly cured to form a high-strength and high-adhesion coating.

Description

Technical Field

[0001] This invention relates to the field of waterproof coating technology, specifically to compositions for two-component waterproof coatings, two-component waterproof coatings, and methods for their preparation. Background Technology

[0002] In construction engineering, waterproofing the concrete substrate is a crucial step. Traditional cement-based penetrating crystalline waterproofing coatings or solvent-based waterproofing coatings have many limitations in actual construction.

[0003] For example, solvent-based products contain a large amount of volatile organic compounds (VOCs), which pollute the environment and are harmful to the health of construction workers; while most reactive waterproof coatings (such as polyurethane and epoxy resin coatings) have extremely strict requirements on the dryness of the substrate, usually requiring a moisture content of less than 8% or even lower.

[0004] However, in actual construction, especially in basements, tunnels, pools, and rainy season construction, the substrate is often difficult to dry completely, and waiting for the substrate to dry will seriously delay the construction period.

[0005] In the existing technology, although some products claim to be usable on damp substrates, they generally have the following problems: (1) slow curing speed: In a damp environment, the curing reaction is interfered with by water molecules, resulting in excessively long surface drying and hard drying time, which affects subsequent processes; (2) low final strength: Water molecules hinder the full cross-linking of film-forming substances, resulting in insufficient strength and hardness of the paint film and poor durability; (3) decreased adhesion: Water molecules form an isolation layer between the substrate and the coating, resulting in a significant reduction in adhesion, making it easy to peel and fall off; (4) poor water resistance: After curing, the coating has a low adhesion retention rate in a long-term immersion environment and is prone to swelling and peeling.

[0006] Therefore, developing a waterproof material that can withstand damp substrates and cure quickly to form a high-strength, high-adhesion coating has significant practical application value. Summary of the Invention

[0007] The purpose of this invention is to provide a waterproof material that can withstand damp substrates and can quickly cure to form a high-strength, high-adhesion coating.

[0008] To achieve the above objectives, a first aspect of the present invention provides a two-component waterproof coating composition comprising component A and component B in a mass ratio of 1:0.5-1.5; Component A comprises a main agent I and an auxiliary agent I. The main agent I contains a polyether hybrid resin, an epoxy resin curing agent, a filler I, a silane coupling agent I, and a catalyst. Based on the total weight of component A, component A contains 30wt%-45wt% of the polyether hybrid resin, 8wt%-12wt% of the epoxy resin curing agent, 40wt%-45wt% of the filler I, 1wt%-3wt% of the silane coupling agent I, and 0.1wt%-0.5wt% of the catalyst. Component B comprises a main agent II and an auxiliary agent II. The main agent II contains epoxy resin, a plasticizer, filler II, and water. Based on the total weight of the components, the components contain 30wt%-50wt% of the epoxy resin, 3wt%-8wt% of the plasticizer, 30wt%-50wt% of the filler II, and 5wt%-15wt% of the water. The polyether hybrid resin is prepared in situ from raw materials including silane-modified polyether resin I, acrylic monomers, silane-modified polyether resin II, chain transfer agent, initiator, chain extender, and silane coupling agent II; the silane coupling agent II contains terminal vinyl or acryloyloxy groups; the viscosity of the silane-modified polyether resin I is less than the viscosity of the silane-modified polyether resin II; the mass ratio of the silane-modified polyether resin I to the silane-modified polyether resin II is 1:1-1.5.

[0009] A second aspect of the present invention provides a method for preparing a two-component waterproof coating, the method comprising using the components of the composition described in the first aspect above, including: Component A and component B are stirred and mixed to obtain the two-component waterproof coating.

[0010] A third aspect of the present invention provides a two-component waterproof coating prepared by the method described in the second aspect above.

[0011] The polyether hybrid resin in component A of the two-component waterproof coating composition provided by this invention can rapidly undergo hydrolysis with water in component B and moisture on the substrate under the action of a catalyst, and simultaneously bond with hydroxyl groups on the surface of the substrate, thereby achieving rapid curing and ultra-high adhesion to damp substrates, and this reaction pathway is not inhibited by moisture. In addition, the epoxy resin curing agent in component A and the epoxy resin in component B can undergo a classic epoxy-amine curing reaction to form a dense, high-strength three-dimensional network structure. The two systems are bridged by silane coupling agent I and produce a hybrid synergistic reaction at the molecular level to form an interpenetrating network structure, so that the obtained two-component waterproof coating combines the excellent permeability, weather resistance, and adaptability to damp substrates of the silane system with the high strength, high adhesion, and excellent chemical resistance of the epoxy system.

[0012] The method for preparing two-component waterproof coatings provided by this invention is simple and easy to operate. Detailed Implementation

[0013] The endpoints and any values ​​of the ranges disclosed herein are not limited to the precise ranges or values, and these ranges or values ​​should be understood to include values ​​close to these ranges or values. For numerical ranges, the endpoint values ​​of the various ranges, the endpoint values ​​of the various ranges and individual point values, and individual point values ​​can be combined with each other to obtain one or more new numerical ranges, which should be considered as specifically disclosed herein.

[0014] It should be noted that, in this invention, "acrylic monomers" refers to monomers containing an acrylic acid structure, monomers containing an acrylate structure, or a mixture of monomers containing a combination of these two structures. Among them, monomers with an acrylic acid structure include acrylic acid or methacrylic acid, while monomers containing an acrylate structure include methyl acrylate, ethyl acrylate, butyl acrylate, hydroxyethyl acrylate, methyl methacrylate, ethyl methacrylate, hydroxyethyl methacrylate, isooctyl methacrylate, and glycidyl methacrylate.

[0015] As previously stated, a first aspect of the present invention provides a two-component waterproof coating composition comprising component A and component B in a mass ratio of 1:0.5-1.5; Component A comprises a main agent I and an auxiliary agent I. The main agent I contains a polyether hybrid resin, an epoxy resin curing agent, a filler I, a silane coupling agent I, and a catalyst. Based on the total weight of component A, component A contains 30wt%-45wt% of the polyether hybrid resin, 8wt%-12wt% of the epoxy resin curing agent, 40wt%-45wt% of the filler I, 1wt%-3wt% of the silane coupling agent I, and 0.1wt%-0.5wt% of the catalyst. Component B comprises a main agent II and an auxiliary agent II. The main agent II contains epoxy resin, a plasticizer, filler II, and water. Based on the total weight of the components, the components contain 30wt%-50wt% of the epoxy resin, 3wt%-8wt% of the plasticizer, 30wt%-50wt% of the filler II, and 5wt%-15wt% of the water. The polyether hybrid resin is prepared in situ from raw materials including silane-modified polyether resin I, acrylic monomers, silane-modified polyether resin II, chain transfer agent, initiator, chain extender, and silane coupling agent II; the silane coupling agent II contains terminal vinyl or acryloyloxy groups; the viscosity of the silane-modified polyether resin I is less than the viscosity of the silane-modified polyether resin II; the mass ratio of the silane-modified polyether resin I to the silane-modified polyether resin II is 1:1-1.5.

[0016] It should be noted that the viscosity of silane-modified polyether resin I and the viscosity of silane-modified polyether resin II in this invention are both obtained by testing at 23°C, and the unit is mPa·s.

[0017] It should be noted that the present invention does not have any particular requirements regarding the type of water, and those skilled in the art can select it as needed. For example, the water can be deionized water or ultrapure water.

[0018] Preferably, the viscosity of the silane-modified polyether resin I at 23°C is 1000-2500 mPa·s.

[0019] In a preferred embodiment, the viscosity of the silane-modified polyether resin II at 23°C is 20,000-40,000 mPa·s.

[0020] According to a preferred embodiment, the in-situ synthesis operation includes: S1: The silane-modified polyether resin I, the acrylic monomer, the silane coupling agent II, the chain transfer agent, and the initiator are subjected to a polymerization reaction to obtain an intermediate; S2: The intermediate, the chain extender and the silane-modified polyether resin II are mixed to obtain the polyether hybrid resin.

[0021] The polyether hybrid resin obtained under the above operation has the characteristics of high solid content and low viscosity. When applied to waterproof coatings, it can enable the waterproof coatings to have a faster curing rate and good adhesion and mechanical properties.

[0022] In a preferred embodiment, the theoretical glass transition temperature of the polyacrylic acid resin segment synthesized from acrylic monomers in the polyether hybrid resin is 10℃-50℃. This preferred embodiment improves the overall properties of the polyether hybrid resin, such as tensile strength, elongation, shear strength, and curing rate, better meeting practical application requirements.

[0023] Preferably, in step S2, the conditions are controlled such that the viscosity of the system after mixing the intermediate, the chain extender and the silane-modified polyether resin II is 20,000-50,000 mPa·s at 23°C.

[0024] It should be noted that the "system viscosity" refers to the viscosity of the overall mixed system containing silane-modified polyether resin II, chain extender, and intermediates. Specifically, silane-modified polyether resin I, silane-modified polyether resin II, and polyacrylate segments undergo a hybridization reaction with silane coupling agents containing terminal vinyl or acryloyloxy groups in their segments, resulting in a combination of properties with high tensile strength, high elongation, and suitable shear strength.

[0025] In the above-mentioned in-situ synthesis process, the connecting effect of silane coupling agent II is utilized to enable the polyacrylic acid resin segments formed by free radical polymerization of acrylic monomers to form an interpenetrating network structure with two silane-modified polyether resins with different viscosities. When applied to the two-component waterproof coating composition provided by this invention, it improves compatibility and blendability, while giving the obtained waterproof coating film better water resistance, chemical resistance and adhesion properties. Its adhesion performance to different types of materials is superior to that of general polyether hybrid resins.

[0026] In some embodiments, silane-modified polyether resin I with relatively low viscosity is used as the system medium for synthesizing polyacrylic acid resin. In the presence of chain transfer agent and initiator, acrylic monomers are synthesized in situ as an intermediate (a mixture of polyacrylic acid resin containing alkoxysilyl groups in the chain segment and silane-modified polyether resin I) under the linkage of silane coupling agent II.

[0027] In some embodiments, chain transfer agents serve to adjust the molecular weight and molecular weight distribution of polyacrylic acid resins prepared from acrylic monomers. A higher amount of chain transfer agent results in a relatively smaller molecular weight of the polyacrylate segments; conversely, a lower amount results in a relatively larger molecular weight of the polyacrylate segments.

[0028] In some embodiments, the free radical polymerization reaction of acrylic monomers and silane coupling agent II is initiated by an initiator.

[0029] In a preferred embodiment, in step S1, the mass ratio of the silane-modified polyether resin I, the acrylic monomer, the silane coupling agent II, the chain transfer agent, and the initiator is 100:30-60:0.5-5:0.3-2:0.5-4.

[0030] In a preferred embodiment, in step S2, the mass ratio of the silane-modified polyether resin II to the chain extender is 1:0.5-0.15.

[0031] Preferably, in step S1, the conditions for the polymerization reaction include: a temperature of 60-100°C and a time of 2-3 hours.

[0032] According to a preferred embodiment, in step S1, before the polymerization reaction, the acrylic monomer, the silane coupling agent II, and the chain transfer agent are first dispersed, dehydrated, and filtered sequentially to obtain a first mixture with a water content of <50ppm; then the first mixture and the initiator are subjected to a second dispersion treatment to obtain a second mixture; then the second mixture and the silane-modified polyether resin I are subjected to a polymerization reaction to obtain the intermediate.

[0033] The present invention does not have special requirements for the conditions of the dewatering treatment, as long as the water content in the first mixture is less than 50 ppm. For example, 5A molecular sieves can be used for dewatering treatment.

[0034] The present invention does not have special requirements for the conditions of the first dispersion treatment and the second dispersion treatment. It is only necessary to ensure that the materials to be dispersed are mixed evenly. Those skilled in the art can choose according to their needs. The present invention will not elaborate further here.

[0035] In a preferred embodiment, step S2 further includes introducing a dehydrating agent during the mixing of the intermediate, the chain extender, and the silane-modified polyether resin II.

[0036] Preferably, the dehydrating agent is selected from at least one of methyltriethoxysilane, vinyltrimethoxysilane, vinyltriacetoxysilane, vinyltriethoxysilane, triacetoxyethylsilane, and hexamethyldisiloxane.

[0037] According to a preferred embodiment, the silane-modified polyether resin I and the silane-modified polyether resin II refer to silane-modified polyether resins having a structure as shown in formula (1): Equation (1), In formula (1), R is a C1 to C2 alkyl group, and n is a positive integer from 10 to 800. For example, the value of n can be 15, 20, 25, 30, 45, 50, 60, 75, 80, 100, 120, 150, 200, 220, 240, 280, 300, 320, 350, 380, 400, 410, 430, 450, 480, 500, 510, 530, 540, 550, 560, 570, 580, 600, 620, 640, 650, 680, 690, 700, 725, 750, 760, 780. The combination of silane-modified polyether resin I and silane-modified polyether resin I with silane coupling agent II and acrylic monomers, which meet the above requirements, can effectively improve the compatibility and mechanical properties of the two resins.

[0038] In a preferred embodiment, the silane-modified polyether resin I is selected from at least one of Wacker Chemie's WACKER® E905, GENIOSIL® XT50, GENIOSIL® XB502, and Ruiyang Antai's 100D.

[0039] In a preferred embodiment, the silane-modified polyether resin II is selected from at least one of Wacker Chemie's WACKER® E10, WACKER® E925, and Ruiyang Antai's 12000DS.

[0040] Preferably, the acrylic monomer is selected from at least one of methyl methacrylate, butyl acrylate, isooctyl acrylate, methacrylic acid, hydroxyethyl acrylate, glycidyl acrylate, glycidyl methacrylate, ethyl acrylate, propyl acrylate, ethyl methacrylate, propyl methacrylate, hydroxypropyl acrylate, hydroxybutyl acrylate, hydroxyethyl methacrylate, hydroxypropyl methacrylate, hydroxybutyl methacrylate, and glycidyl acrylate.

[0041] Preferably, the acrylic monomer is a combination of methyl methacrylate, butyl acrylate, isooctyl acrylate, methacrylic acid, and hydroxyethyl acrylate.

[0042] In a preferred embodiment, the acrylic monomer is a combination of methyl methacrylate, butyl acrylate, isooctyl acrylate, glycidyl methacrylate, and hydroxyethyl acrylate.

[0043] In a preferred embodiment, the silane coupling agent II is selected from one or more combinations of vinyltrimethoxysilane, 3-acryloyloxytrimethoxysilane, 3-acryloyloxytriethoxysilane, 3-acryloyloxypropylmethyldimethoxysilane, 3-acryloyloxypropyldimethylmethoxysilane, γ-methacryloyloxypropyltrimethoxysilane, γ-methacryloyloxypropylmethyldimethoxysilane, γ-methacryloyloxypropyltriethoxysilane, and 3-methacryloyloxypropyltriisopropoxysilane.

[0044] Preferably, the chain transfer agent is selected from at least one of isooctyl 3-mercaptopropionate, dodecyl mercaptan, and α-methylstyrene dimer.

[0045] Preferably, the initiator is selected from at least one of azobisisobutyronitrile, tert-butyl peroxide-2-ethylhexanoate, and benzoyl peroxide.

[0046] In a preferred embodiment, the chain extender is selected from at least one of diphenyldimethoxysilane, dimethyldimethoxysilane, methyltrimethoxysilane, and phenyltrimethoxysilane.

[0047] In a preferred embodiment, the additive I includes an accelerator, an antifoaming agent I, and a leveling agent; based on the total weight of component A, component A contains 0.2wt%-1.0wt% of the accelerator, 1wt%-2wt% of the antifoaming agent I, and 0.1wt%-0.6wt% of the leveling agent.

[0048] Preferably, the auxiliary agent II includes defoamer II and wetting agent; based on the total weight of component B, component B contains 0.5wt%-4wt% of the defoamer II and 0.2wt%-0.5wt% of the wetting agent.

[0049] Preferably, the accelerator is 1,4-diazabicyclo[2.2.2]octane.

[0050] Preferably, the defoamer I and the defoamer II are each independently selected from at least one of silicone defoamers, polyether defoamers, organic fatty acid defoamers, and organic fatty ester defoamers.

[0051] In a preferred embodiment, the epoxy resin curing agent is a phenolic amine curing agent and / or a polyamide curing agent.

[0052] In a preferred embodiment, the epoxy resin is E-44 epoxy resin and / or E-51 epoxy resin; Preferably, the plasticizer is dioctyl phthalate and / or a bio-based plasticizer.

[0053] In a preferred embodiment, the bio-based plasticizer is selected from at least one of epoxidized soybean oil, epoxidized castor oil, epoxidized palm oil, chlorinated palm oil, soybean methyl ester, butyl castor oil, and linseed oil polyol ester.

[0054] Preferably, filler I and filler II are each independently selected from at least one of heavy calcium carbonate, quartz powder, and talc powder.

[0055] In a preferred embodiment, the catalyst is dibutyltin dilaurate.

[0056] Preferably, the silane coupling agent I is an epoxy silane and / or an amino silane, and more preferably KH-560.

[0057] As previously described, a second aspect of the present invention provides a method for preparing a two-component waterproof coating, the method comprising using the components of the composition described in the first aspect, including: Component A and component B are stirred and mixed to obtain the two-component waterproof coating.

[0058] As previously stated, a third aspect of the present invention provides a two-component waterproof coating prepared by the method described in the second aspect above.

[0059] The present invention will be described in detail below through examples. Unless otherwise specified, the instruments, reagents, and materials involved in the following examples are all conventional instruments, reagents, and materials, which can be obtained through legitimate commercial channels. Unless otherwise stated, all reagents used are commercially available analytical grade products.

[0060] Silane-modified polyether resin I: Silane-modified polyether resin I-1: Ruiyang Antai 100D, with a viscosity of 1200 mPa•s at 23℃ and a tensile strength of 1.2MPa, purchased from Jiangsu Ruiyang Antai New Material Technology Co., Ltd.

[0061] Silane-modified polyether resin I-2: WACKER® E905, with a viscosity of 2200 mPa•s at 23°C and a tensile strength of 4.4 MPa, was purchased from Wacker Chemie (China) Co., Ltd.

[0062] Silane-modified polyether resin II: Silane-modified polyether resin II-1: Ruiyang Antai 12000DS, with a viscosity of 20,000 mPa•s at 23℃ and a tensile strength of 3.2 MPa, purchased from Jiangsu Ruiyang Antai New Material Technology Co., Ltd.

[0063] Silane-modified polyether resin II-2: WACKER ® E925, with a viscosity of 25,000 mPa•s at 23°C and a tensile strength of 3.5 MPa, was purchased from Wacker Chemie (China) Co., Ltd.

[0064] Silane Coupling Agent II: Silane coupling agent II-1: γ-methacryloyloxypropyltriethoxysilane.

[0065] Chain transfer agent: Isooctyl 3-mercaptopropionate.

[0066] Initiator: Initiator I: tert-butyl peroxide-2-ethylhexanoate, abbreviated as TBPEH.

[0067] Initiator II: Azobisisobutyronitrile (AIBN).

[0068] Chain extender: dimethyldimethoxysilane.

[0069] Dehydrating agent: Vinyltrimethoxysilane.

[0070] Catalyst: Dibutyltin dilaurate.

[0071] Accelerator: 1,4-diazabicyclo[2.2.2]octane, abbreviated as DABCO.

[0072] Silane coupling agent I: KH-560.

[0073] Epoxy resin curing agent: Phenolic amine curing agent, abbreviated as T-31, purchased from Shandong Deyuan Epoxy Technology Co., Ltd.

[0074] Epoxy resin: E-51 epoxy resin, purchased from Jinan Baorui Resin Chemical Co., Ltd.

[0075] Plasticizer: Dioctyl phthalate, abbreviated as DOP.

[0076] Packing material I and packing material II: both are heavy calcium carbonate, 800 mesh (Chinese standard sieve).

[0077] Defoamer I and Defoamer II: Both are silicone defoamers, purchased from Guangdong Shierli New Materials Co., Ltd., brand name D6800.

[0078] Leveling agent: Organosilicon leveling agent, purchased from BYK Chemicals, brand name BYK-317.

[0079] Wetting agent: purchased from Core Chemicals Ltd., brand name S18.

[0080] In the following examples, each part by weight = 10g.

[0081] In the following examples of the present invention, room temperature refers to 25-30℃.

[0082] The following preparation examples and comparative examples are used to illustrate the preparation of polyether hybrid resins.

[0083] Preparation Example 1 S1: Acrylic monomers, silane coupling agent II-1 and chain transfer agent are subjected to a first dispersion treatment, a dehydration treatment (100 parts by weight of 5A molecular sieve) and filtration (removal of 5A molecular sieve) in sequence to obtain a first mixture with a water content of <50ppm; The first mixture and initiator I were subjected to a second dispersion treatment to obtain a second mixture; under thorough stirring, the second mixture was slowly added dropwise (to be completed in 2 hours) to silane-modified polyether resin I for polymerization reaction (80°C, held for 3 hours), and then cooled to room temperature to obtain the intermediate. S2: The intermediate, the chain extender, the silane-modified polyether resin II, and the dehydrating agent are mixed (12h) to obtain the polyether hybrid resin; The formulation for this preparation example 1 is shown in Table 1; In this preparation example, in step S1, the theoretical glass transition temperature of the polyacrylic acid resin chain segment formed by the acrylic monomer is 46°C.

[0084] Preparation Example 2 This preparation example was carried out using a similar method to Preparation Example 1, except that the formulation is shown in Table 1. All parts not listed are the same as in Example 1; In this preparation example, in step S1, the theoretical glass transition temperature of the polyacrylic acid resin chain segment formed by the acrylic monomer is 28°C.

[0085] Preparation Example 3 This preparation example was carried out using a similar method to Preparation Example 1, except that the formulation is shown in Table 1. All parts not listed are the same as in Example 1; In this preparation example, in step S1, the theoretical glass transition temperature of the polyacrylic acid resin chain segment formed by the acrylic monomer is 10°C.

[0086] Preparation Example 4 This preparation example was carried out using a similar method to Preparation Example 1, except that the formulation is shown in Table 1. All parts not listed are the same as in Example 1; In this preparation example, in step S1, the theoretical glass transition temperature of the polyacrylic acid resin chain segment formed by the acrylic monomer is 20°C.

[0087] Preparation Example 5 This preparation example was carried out using a similar method to Preparation Example 1, except that the formulation is shown in Table 1. All parts not listed are the same as in Example 1; In this preparation example, in step S1, the theoretical glass transition temperature of the polyacrylic acid resin chain segment formed by the acrylic monomer is 28°C.

[0088] Preparation Example 6 This preparation example was carried out using a similar method to Preparation Example 1, except that the formulation is shown in Table 1. All parts not listed are the same as in Example 1; In this preparation example, in step S1, the theoretical glass transition temperature of the polyacrylic acid resin chain segment formed by the acrylic monomer is 20°C.

[0089] Preparation Example 7 This preparation example was carried out using a similar method to Preparation Example 1, except that the formulation is shown in Table 1. All parts not listed are the same as in Example 1; In this preparation example, in step S1, the theoretical glass transition temperature of the polyacrylic acid resin chain segment formed by the acrylic monomer is 37°C.

[0090] Preparation Example 8 This preparation example was carried out using a similar method to Preparation Example 1, except that the formulation is shown in Table 1. All parts not listed are the same as in Example 1; In this preparation example, in step S1, the theoretical glass transition temperature of the polyacrylic acid resin chain segment formed by the acrylic monomer is 42°C.

[0091] Preparation Example 9 This preparation example was carried out using a similar method to Preparation Example 1, except that the formulation is shown in Table 1. All parts not listed are the same as in Example 1; In this preparation example, in step S1, the theoretical glass transition temperature of the polyacrylic acid resin chain segment formed by the acrylic monomer is 14°C.

[0092] Preparation Example 10 This preparation example was carried out using a similar method to Preparation Example 1, except that the formulation was different, as shown in Table 1; and the polymerization temperature in this preparation example was 100°C. All parts not listed are the same as in Example 1; In this preparation example, in step S1, the theoretical glass transition temperature of the polyacrylic acid resin chain segment formed by the acrylic monomer is 24°C.

[0093] Table 1

[0094] Continued from Table 1

[0095] Comparative Preparation Example 1 This comparative preparation example was prepared using a method similar to that of Preparation Example 1, except that in step S2, the amount of silane-modified polyether resin II-1 was adjusted to 60 parts by weight. All parts not listed are the same as in Example 1.

[0096] Comparative Preparation Example 2 This comparative preparation example was prepared using a method similar to that of Preparation Example 1, except that: in step S1, the amount of silane-modified polyether resin I-1 was adjusted to 30 parts by weight; and in step S2, the amount of silane-modified polyether resin II-1 was adjusted to 60 parts by weight. All parts not listed are the same as in Example 1.

[0097] Comparative preparation example 3 This comparative preparation example was prepared using a method similar to that of Preparation Example 1, except that silane coupling agent II-1 and chain transfer agent were not added in step S1. All parts not listed are the same as in Example 1.

[0098] Example 1 This example illustrates the preparation of a two-component waterproof coating according to the formulation in Table 2 and the following steps: (1) Preparation of component A: Add polyether hybrid resin, catalyst, accelerator, silane coupling agent I, and epoxy resin curing agent to a mixing tank in sequence. After stirring at low speed until uniform, add filler I, defoamer I, and leveling agent. Disperse at high speed until uniform and free of particles. Set aside for later use. Preparation of component B: In another mixing vessel, epoxy resin, plasticizer and deionized water are added in sequence. After stirring at low speed until uniform, filler II, defoamer II and wetting agent are added and dispersed at high speed until uniform. The material is then discharged for later use. (2) Mix component A and component B to obtain the two-component waterproof coating.

[0099] Table 2

[0100] Note: "Component A: Component B" refers to the mass ratio of Component A to Component B in a two-component waterproof coating.

[0101] Example 2 This embodiment uses a similar method to Example 1, except for the formulation, which is shown in Table 2. Any parts not listed are the same as in Example 1.

[0102] Examples 3-10 Examples 3-10 were all carried out using a method similar to that of Example 1. The difference was that the polyether hybrid resin in Example 1 was replaced with an equal mass of the polyether hybrid resin prepared in the aforementioned Preparation Examples 3-10. All parts not listed were the same as in Example 1.

[0103] Comparative Examples 1-3 Comparative Examples 1-3 were all carried out using a method similar to that of Example 1. The difference was that the polyether hybrid resin in Example 1 was replaced with an equal mass of the polyether hybrid resin prepared in the aforementioned Comparative Preparation Examples 1-3. All parts not listed were the same as in Example 1.

[0104] Comparative Example 4 This comparative example was conducted using a method similar to that of Example 1. The difference is that the total mass of components A and B remained constant, and the mass ratio of components A and B was adjusted to 1:3. All other parts not listed are the same as in Example 1.

[0105] Comparative Example 5 This comparative example was conducted using a method similar to that of Example 1, except for the formulation, which is shown in Table 2. Any parts not listed are the same as in Example 1.

[0106] Test case 1. The performance of the two-component waterproof coatings prepared in the above examples was tested, specifically: Test the surface drying time and actual drying time according to the methods specified in GB / T 1728; Tensile strength, wet substrate bond strength, and bond strength after immersion in water for 7 days were tested according to the methods specified in GB / T 16777. The test method for retention rate after immersion is as follows: Specimens are prepared according to the method specified in GB / T 16777-2008 7.1 (Method A). The initial bond strength is tested after curing for 7 days under standard test conditions (23±2℃, relative humidity 50±10%). The specimens are then completely immersed in water, removed after a predetermined time (168h), and placed under standard test conditions for 12h before testing the bond strength. The bond strength retention rate after immersion is calculated as (bond strength / initial bond strength). 100%.

[0107] The test results are shown in Table 3: Table 3

[0108] The results above show that the two-component waterproof coating obtained by using the composition for two-component waterproof coating provided by the present invention combines the excellent permeability, weather resistance, and adaptability to damp substrates of the silane system with the high strength, high adhesion, and excellent chemical resistance of the epoxy system.

[0109] The preferred embodiments of the present invention have been described in detail above; however, the present invention is not limited thereto. Within the scope of the inventive concept, various simple modifications can be made to the technical solutions of the present invention, including combinations of various technical features in any other suitable manner. These simple modifications and combinations should also be considered as the content disclosed in the present invention and are all within the protection scope of the present invention.

Claims

1. A composition for a two-component waterproof coating, characterized in that, The composition comprises component A and component B in a mass ratio of 1:0.5-1.5; Component A includes main agent I and auxiliary agent I. Main agent I contains polyether hybrid resin, epoxy resin curing agent, filler I, silane coupling agent I and catalyst. Based on the total weight of component A, component A contains 30wt%-45wt% of the polyether hybrid resin, 8wt%-12wt% of the epoxy resin curing agent, 40wt%-45wt% of filler I, 1wt%-3wt% of the silane coupling agent I, and 0.1wt%-0.5wt% of the catalyst; Component B comprises a main agent II and an auxiliary agent II. The main agent II contains epoxy resin, a plasticizer, filler II, and water. Based on the total weight of the components, the components contain 30wt%-50wt% of the epoxy resin, 3wt%-8wt% of the plasticizer, 30wt%-50wt% of the filler II, and 5wt%-15wt% of the water. The polyether hybrid resin is prepared in situ from raw materials including silane-modified polyether resin I, acrylic monomers, silane-modified polyether resin II, chain transfer agent, initiator, chain extender, and silane coupling agent II; the silane coupling agent II contains terminal vinyl or acryloyloxy groups; the viscosity of the silane-modified polyether resin I is less than the viscosity of the silane-modified polyether resin II; the mass ratio of the silane-modified polyether resin I to the silane-modified polyether resin II is 1:1-1.

5.

2. The composition according to claim 1, characterized in that, The viscosity of the silane-modified polyether resin I at 23°C is 1000-2500 mPa·s; And / or, the viscosity of the silane-modified polyether resin II at 23°C is 20,000-40,000 mPa·s.

3. The composition according to claim 2, characterized in that, The in-situ synthesis operation includes: S1: The silane-modified polyether resin I, the acrylic monomer, the silane coupling agent II, the chain transfer agent, and the initiator are subjected to a polymerization reaction to obtain an intermediate; S2: The intermediate, the chain extender and the silane-modified polyether resin II are mixed to obtain the polyether hybrid resin.

4. The composition according to claim 3, characterized in that, In step S1, the mass ratio of the silane-modified polyether resin I, the acrylic monomer, the silane coupling agent II, the chain transfer agent, and the initiator is 100:30-60:0.5-5:0.3-2:0.5-4. And / or, in step S2, the mass ratio of the silane-modified polyether resin II to the chain extender is 1:0.5-0.15; And / or, in step S1, the conditions for the polymerization reaction include: a temperature of 60-100°C and a time of 2-3 hours.

5. The composition according to claim 3, characterized in that, The silane-modified polyether resin I is selected from at least one of WACKER® E905, GENIOSIL® XT50, GENIOSIL® XB502 from Wacker Chemie and 100D from Ruiyang Antai. And / or, the silane-modified polyether resin II is selected from at least one of WACKER® E10, WACKER® E925 from Wacker Chemie, and 12000DS from Ruiyang Antai; And / or, the acrylic monomer is selected from at least one of methyl methacrylate, butyl acrylate, isooctyl acrylate, methacrylic acid, hydroxyethyl acrylate, glycidyl acrylate, glycidyl methacrylate, ethyl acrylate, propyl acrylate, ethyl methacrylate, propyl methacrylate, hydroxypropyl acrylate, hydroxybutyl acrylate, hydroxyethyl methacrylate, hydroxypropyl methacrylate, hydroxybutyl methacrylate, and glycidyl acrylate; And / or, the silane coupling agent II is selected from one or more combinations of vinyltrimethoxysilane, 3-acryloyloxytrimethoxysilane, 3-acryloyloxytriethoxysilane, 3-acryloyloxypropylmethyldimethoxysilane, 3-acryloyloxypropyldimethylmethoxysilane, γ-methacryloyloxypropyltrimethoxysilane, γ-methacryloyloxypropylmethyldimethoxysilane, γ-methacryloyloxypropyltriethoxysilane, and 3-methacryloyloxypropyltriisopropoxysilane; And / or, the chain transfer agent is selected from at least one of isooctyl 3-mercaptopropionate, dodecyl mercaptan, and α-methylstyrene dimer; And / or, the initiator is selected from at least one of azobisisobutyronitrile, tert-butyl peroxide-2-ethylhexanoate, and benzoyl peroxide; And / or, the chain extender is selected from at least one of diphenyldimethoxysilane, dimethyldimethoxysilane, methyltrimethoxysilane, and phenyltrimethoxysilane.

6. The composition according to any one of claims 1-5, characterized in that, The additive I includes an accelerator, an antifoaming agent I, and a leveling agent; based on the total weight of component A, component A contains 0.2wt%-1.0wt% of the accelerator, 1wt%-2wt% of the antifoaming agent I, and 0.1wt%-0.6wt% of the leveling agent; And / or, the auxiliary agent II includes defoamer II and wetting agent; based on the total weight of the B component, the B component contains 0.5wt%-4wt% of the defoamer II and 0.2wt%-0.5wt% of the wetting agent.

7. The composition according to claim 6, characterized in that, The accelerator is 1,4-diazabicyclo[2.2.2]octane; And / or, the defoamer I and the defoamer II are each independently selected from at least one of silicone defoamers, polyether defoamers, organic fatty acid defoamers, and organic fatty ester defoamers.

8. The composition according to any one of claims 1-5, characterized in that, The epoxy resin curing agent is a phenolic amine curing agent and / or a polyamide curing agent; And / or, the epoxy resin is E-44 epoxy resin and / or E-51 epoxy resin; And / or, the plasticizer is dioctyl phthalate and / or a bio-based plasticizer; And / or, the filler I and the filler II are each independently selected from at least one of heavy calcium carbonate, quartz powder, and talc powder; And / or, the catalyst is dibutyltin dilaurate; And / or, the silane coupling agent I is an epoxy silane and / or an amino silane.

9. A method for preparing a two-component waterproof coating, characterized in that, This method is performed using any of the components in the composition according to any one of claims 1-8, comprising: Component A and component B are stirred and mixed to obtain the two-component waterproof coating.

10. A two-component waterproof coating prepared by the method of claim 9.

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